I had a Pair of JTR Captivators which are ported 18" drivers (passives, driven with around 1K watts each) which was great for movies but in my opinion was not tight enough for certain types of music (Jazz, acoustic, detailed stuff). So built 2 sealed cabinets housing 4 Dayton 18s each, providing about 3cu ft per driver, which is a little small because they are being boosted below 20Hz and being fed 5000watts per cabinet. These are also great for movies but not as tight as the VMPS largers. The largers were great for music but would bottom out on movie peaks occasionally which is unacceptable. Although I only sit 13 ft from the speakers & screen, the open space of the room is about 30-40,000ft³ and it's hard to pressurize the space.
I guess my only question is "Can my 2 VMPS Larger Subs (with the Dayton HF Drivers & BB PR be used effectively for very high output in the 60Hz to 175 Hz region to produce good midbass thump with 1250 watts apiece."